Door latch



Oct. 13, 1931. J. J. PIPER DOOR LATCH Filed March 14, 1930 2SheetsQSheet l y da. ATTORNEY wlNEss z@ L Oct. 13, 1931. J, plpER1,827,400

DooR LATCH Filed March 14, 1950 2 Sheets-Sheet 2 l TNVENTOR ATTORNEYyPa'it'emegi oct. y13,` .1931; `i

- JAMES Jiflyln'iziz,4 i orI "srokANEg Wissie:meroirI LvTitis`havemoi;,riferi`'J l t l end the' like and,-inoreparticularly-to suchas i 'are'used oriautoliiohiledoors.`

A primary robject ofthe. inventioni 15d pr- 'vde @Simple/g andefe1itd0orf1at-h whiffh will securely 'holdfthe door in cloc'iskelkposition f In cgtrryingotitthefse objectsQthe iiierition lis susceptibleof "a, 'WilueflyingeY of -modificzitlon wthoutdepartihg from thespiitit'oftheiih- Y ventio'ncr secrificing.v any I,of the advantages of; theclaimed. ,'invention'; there ybeing shown l l `preferrd aliidpr'zicticl'fjform;

in the,difagwingSf-foiillustrtie 101111995@V :a whiCh-r levationof'afron Y the latchfiriember the cleV Y, .om parts shownzinthe sureinjCorinectionl with Which it tbelisel with the r4parts normalklocked- Ap0-` Stong.; Fig; 3 is A2 Similargvew fwithjj baits shown ili urilockfedgo'r ,inoperativeo'sition Figjfi is verticalsectionshowirigvtheletch` 6l is a detail perspectiifefxiiewof operating.cam and `its connected ypartsy shown .Cletidled;iV i A Fig. 7 ishorizontal sectiorifteken' on the Fig. Sis atv/ie( simi'lartd-` Fig.5,Withfthe W position assumed wh latch is retracted; A

' .upper portion of the.' latch with .this lcain Fig." 8 ;y and? Alocking 'amdet'ached from, the Positifn She-W11.

the

' In; the `ey bodi enti,illustriy v on an 'automobile door l, viithfallcooperating-f Fig. 5f is 'Vearelevgttio ofthe .the

l th-limb# constituting this :invention .ah'din 1 i atedflas ai oftheautomobile Qinthe ,door Opening. thereof ini! thjllsualjin ahrier lan'd[providedf with ka trasfversely 'arranged cainbarfaffore pliralorigitsrear -edge whichqltter is -desigried to lit'withihr theoflooropeningemol besecured i tothe door by bolts .12. Y .z

The 'door l iscut out atvits.frohtedge Kto` receivel the latchcarryingholi'sihg ll` which i isfsho'wn substantiallyy UfshejpedAinjcross ysec'- #i015 `beingV open/ aty its :top' and bottomA and Ashaft-13v` Whichy 4eifrig-is the door knobs f Y Vextends 'throughthehoiisingzllendl-has ixed l i 'thereto Y lWithin said Ahousing a;.yoke,-shqoedv f cam'lgiiicluding.sa part-thereoffaghlockf16'l`1m`fir`1gaV borel throiigh which,.theshafty Y lil-terllv from theinner fa ce 'of the upperjend i its lower endtothefronitwlLof-thehmisinq Y t 1.1` asis shown clearlv inFisrs; 4-1 and-alsoiIrFig. 8. -y-,This ar1r122 is made in the form of a4 heavyfmetaljplateorV n thickness suicient to resist .the strain to whi chit i ssiihiect'ed sind ofV length suiiicient so that when swung on I a' pivotits free holtlcarrvin' end will'ffmove throughs-n :irc of aycircle-forrtpurposeto onithe .outer face"thereof"areftwo'laterlly vprojecting boltsy 24 anrl. 25 which onemtelih train sversi'elv extending slots 26" d27 formed v in thefront face of the housingr y11 isiss'hown 1 clerly iii Figs. 2f yThese;lockir'iy;bolts 'v 24 and"25'areflorigi-tdiimllyv spa-cedy 'from reach' otherony thelzgrm22"sind.errangedA out ofk longitudinal alihemetas are lsQfthe'o'pen fthe @using throilsh'whshf this connection.

The other end of the coil spring 28 is connected with a cross rod orbolt 31 extending through the side members of the housing at the lowerends thereof. This spring 28 is placed under tension when the camcarrying shaft or shank 13 is turned in either one direction or theothervby means of the knobs 14 and operates to return the shaft tonormal position after the knobs are released A substantially Ueshapedbar 32 is mounted in the housing' with thelegs thereof bolted orotherwise secured to the side members of the housing and with thecros'sbar spaced from the front wall of the housing afsuflicient Y distance topermit the arm 22 to move freely back and forth between it and said walland which `operates to prevent said arm from getting out of place.

Arranged between vone edge of the arm 22 and the adjacent sidewalloffthe housing: are a plurality of coiled springs 33, three of which arehere shown, although obviously any desired number may be employed andwhich exert their tension to move the arm away Afrom the sidewall of thehousing against which the springs bear after it has been' forced towardssaid side wall by turningr of the Vshaft 13 in a manner presently to bedescribed. Y Y

These springs 33 have one end inserted.V in sockets in the edge of thearm 22 as is shown clearly at 34 in Fie. 6 and bymeans of which saidspringsare reliably retained in operative position. f L v TheV cam'bar3a is arranged transversely of the door frame in position to extendbetween or be straddled by the bolts 24 and 25 when the door is closed.The swingingfof these bolts in the arc of a circle causes them togrippinely engage the upper and lower edges of the bar 3a when the dooris closed as shown in Figs. 1 and 2 so that any force exerted to openVthe door without turning shaft 13 will cause the bolts to more lfirmlyQrip the 'bar and thus prevent such opening'. The turninp; of one of theknobs 14 andthe consequent turning of shaft 13 'will through the meansabove described move the bolts 24 and 25 so that they will paralleltheupper and lower edges of the b'ar 3a and thus permit the door toswing freely out to open position.

It will thus be seen that when the shaft 13 is turned in either onedirectionor the other by means of the knobs 14 the cam 15 will be turnedwith it and thevcam edfge 20 thereof engaged with the sleeve 21a willoperate to move the arm 221edgewiseagainstfthe ten`l sion of the springs33 thereby causing the 'locking bolts 24and 25 to move transversely ofthe housing-through thev slots26fa-'nd 27 the door, butgalso prevent allpossibility lof rattling of the parts. This construction owing' to thegliding of the bolts on the cam bar,

also prevents any clicking of the door when it is shut thus providing anoiseless latch whereby the door maybe closed and locked softlywithoutvslamming and which may be readily opened by simply turning1 oneof the knobs in either direction, up or down.

Thislatch is not only noiseless and effec'- tivein its operation but issimple-and cheap to manufacture and has few parts to get out of order'and when one of the springs' bevcomes depleted or broken in any way itAmay Y be very easily replaced, the other parts of the device beingpractically wearproof. The

yoke 15 isadjustably mounted on the shaft or shank 13 bymeanslof the setscrew or bolt 18 so that in case there should be wear beltween thismember and the operating stub shaft 21 vthe cam may be adjusted tocompensate for this wear. i Without further description it is thoughtthat the features.y and advantages of the invention will be readilyapparentV to those skilled inthe art, andv it will, of course, beunderstoodthat changes in the form, proportion and minor details ofconstructionmay be' resorted to, without departing'fromlthe spirit ofthe invention or its scope as claimed.

1'. A door latch comprising` a supporting structure, an arm'pivoted tooscillate on said structure and normally urged to swine; in onedirection, a locking member carried by said arm, a door knob having ashank mounted to turn in said structure, a cam mounted on said shank, acooperating element carried by said arm in the path of said cam adaptedto be engaged by the cam on the turning of the shank to move said arminto unlocking position, said cam beine; adjustable on said shank tocompensate for wear when necessary, and means to return said knob tonormal position when having means for engagement with said pro; f"jection to limit the lockingV movement .ofthe arm; v

shaped cam straddling said shank and yadjustably mounted thereon,projection carf i' riedby said` arminthe path of said cam'` nWherebyothe' turning of said shank will oper-l l 'Y y ate to move saidarminto unlocking position, Y -and a coiled spring connected with saidcam and` housing for returning the shank to normal position When theknob is released;

4. In a doorlatch, asupporting. structure. an arm pivoted tooscillate onsaidv structure, laterally projecting longitudinally spaced i 4 boltscarriedby the free end of saidarm. a

bar to be mountedon a support and cooperat' ing With said bol-ts to lockthem together.

said bar being straddled bythe bolts and 'grip'pingly engaged onopposite edges thereby when the arm; is swung infone direction, said barbeing released when the arm is swung" in the opposite direction.

' 5.ln adoor latch, a vsupporting structure,

an arm pivoted to oscillateon'said structure'. 'laterally projectingylongitudinally spaced ,Y f Y VVbolts carried the-free end of saidarmand y arranged*y in plane-s spacedf' laterally from each otherf,a ndfabar 4to be mountedon a supfspaced laterally from eachother, anda bar tobe mounted on a support andcooperatin'g With said bolts'to lockythemtogether,"said Abar being straddledl by the bolts Vand'grip--engaged `on opposite edgesthereby V o When the ,arm is swung in onedirection, said y `bar being released When the arm is swungfin portgandcooperating with said boltsto lock Athern toegther,

an arm piyoted to oscillateon said structure,

laterally projecting longitudinally spaced bolts carried by theffreeendof said arm/and n adapted to'sWing therewith inyan arc ofa; v circle,saidbolts being" arranged in planes extending longitudinally of' the armrand pingly the opposite direction, and means orjautomatically'vswinging said arm into lockingv position.'V s

saidY bar' being stradd'led by f' Y' v the bolts and grippinglyengagedon opposite ,y edges thereby When the armvis swungfin'r one Ydirection, said-bar being .released 4When the arm: is swung intheopposite direction. .j6; Inga vdoor latch,- a supporting structure,`

